Add --in-place option.

Signed-off-by: Rolf Schröder <rolf.schr@gmail.com>

Author: rolfschr

etc/nix/get-latest-pypi-deps-db.sh

@@ -7,6 +7,16 @@ COMMIT=$(sed '1q;d' <<< "$DATA")
 DATE=$(sed '2q;d' <<< "$DATA")
 SHA256=$(nix-prefetch-url --unpack --type sha256 "https://github.com/$USER_SLASH_REPO/tarball/$COMMIT" | tail -n 1)
 
+NIX_REV_ATTR="pypiDataRev = \"$COMMIT\"; # $DATE"
+NIX_SHA_ATTR="pypiDataSha256 = \"$SHA256\";"
+
 echo ""
-echo "pypiDataRev = \"$COMMIT\"; # $DATE"
-echo "pypiDataSha256 = \"$SHA256\";"
+echo $NIX_REV_ATTR
+echo $NIX_SHA_ATTR
+
+if [[ "$1" = "--in-place" ]] ; then
+  # Replace the values in the flake.
+  PATTERN="\s*\n?\s*\"[^\n]+" # <space><newline><space>"content...<newline>
+  perl -i.bak1 -0777 -pe "s/pypiDataRev =$PATTERN/$NIX_REV_ATTR/" flake.nix
+  perl -i.bak2 -0777 -pe "s/pypiDataSha256 =$PATTERN/$NIX_SHA_ATTR/" flake.nix
+fi